code: def argmax(
      x: Union[(None, mx.ndarray.NDArray)],
      /,
      *,
      axis: Optional[int] = None,
      keepdims: bool = False,
      dtype: Optional[Union[(ivy.Dtype, ivy.NativeDtype)]] = None,
      select_last_index: bool = False,
      out: Optional[Union[(None, mx.ndarray.NDArray)]] = None,
  ) -> Union[(None, mx.ndarray.NDArray)]:
      raise IvyNotImplementedException()
  
file_path: ivy/ivy/functional/backends/mxnet/searching.py
imports: import mxnet
  from numbers import Number
  from typing import Optional, Union, Tuple
  import numpy
  import ivy
  from ivy.utils.exceptions import IvyNotImplementedException
label_desc: Use image node_id 1 for calling a global function with example usage: argmax() without return types